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Rapid Tetra-Primer Amplification Refractory Mutation System-Polymerase Chain Reaction Protocol for Detection of Y132F Mutation in Fluconazole Resistant Candida parapsilosis .
Microbial Drug Resistance : MDR : Mechanisms, Epidemiology, and Disease 2024 Februrary 12
There is an emerging fluconazole resistance in Candida parapsilosis in recent years. The leading mechanism causing azole resistance in C. parapsilosis is the Y132F codon alteration in the ERG11 gene which encodes the target enzyme of azole drugs. In this study, we evaluated the sensitivity, compatibility, and specificity of a novel tetra-primer amplification refractory mutation system-polymerase chain reaction (T-ARMS-PCR) method for rapid detection of the Y132F mutation in fluconazole nonsusceptible C. parapsilosis. Antifungal susceptibility tests for detection of fluconazole resistance were performed by broth microdilution according to the CLSI guidelines. All susceptible and nonsusceptible C. parapsilosis isolates were analyzed for ERG11 mutations with Sanger sequencing. T-ARMS-PCR was fully concordant with the Sanger sequencing (100% of sensitivity and specificity) for detection of Y132F mutations. T-ARMS-PCR method could be a rapid, simple, accurate, and economical assay in the early detection of the most common cause of fluconazole resistance in C. parapsilosis isolates. In routine laboratories with high C. parapsilosis isolation rates, performing the T-ARMS-PCR for early detection of the most common reason of fluconazole resistance in C. parapsilo sis, could be a life-saving approach for directing antifungal therapy before obtaining the definitive antifungal susceptibility tests results.
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